diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index 2254df1c..f67c30e3 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -444,7 +444,7 @@ declare module 'xterm' {
      * This will only take effect when @param overviewRulerOptions
      * were provided initially.
      */
-     overviewRulerOptions?: IDecorationOverviewRulerOptions;
+     overviewRulerOptions?: Pick<IDecorationOverviewRulerOptions, 'color'>;
   }